High-Precision Adaptive Slope Compensation Circuit for DC-DC Converter in Wearable Devices

Hua Fan,Lang Feng,Dagang Li,Quanyuan Feng,Yuanjun Cen,Hadi Heidari,Weiping Cheng,Xiaopeng Diao

doi:10.1109/access.2020.2974852

Abstract

This paper presents a high precision adaptive slope compensation circuit for for DC-DC converter in wearable devices. Compared with the traditional adaptive slope compensation circuit, the comparator is used to sample the output voltage and input voltage, which greatly improves the accuracy.In this paper, the circuit is designed in UMC 0.18- $\mu \text{m}$ CMOS Technology and verified by Virtuoso Spectre Circuit Simulator. The simulation results show that the accuracy of the adaptive slope compensation circuit in this paper can reach more than 96%.

Highlights

With the rapid development of power electronic technology and computer-based information technology, power management chips are widely used in industrial, medical, military, consumer and other electronic products [1]
Switching power supply has the advantages of small size, light weight, large voltage range and high efficiency. It is widely used in terminal equipment, communication equipment and other electronic equipment dominated by electronic computers
The switching mode power supply is a kind of power supply which uses modern power electronics technology to

Summary

INTRODUCTION

With the rapid development of power electronic technology and computer-based information technology, power management chips are widely used in industrial, medical, military, consumer and other electronic products [1]. Switching power supply has the advantages of small size, light weight, large voltage range and high efficiency It is widely used in terminal equipment, communication equipment and other electronic equipment dominated by electronic computers. When 0< t≤TON , the power switching transistor MP is in the conducting status, here TON is the conduction time of the switching transistor, and the equivalent circuit of the main circuit in the conducting status is shown in Fig. 2 (b) At this point, the inductive current increases linearly, and the amount of increase is: IL (+). When TON < t≤T, the power switching transistor MP cuts off, here TOFF is the conduction time of the switching transistor, and the equivalent circuit of the main circuit in the non-conducting status is shown in Fig. 2 (c) At this time, the inductance current decreases linearly. The relationship between output voltage and input voltage and duty ratio can be obtained as follows:

PEAK CURRENT CONTROL MODE

TRADITIONAL SLOPE COMPENSATION PRINCIPLE

DESIGN OF SLOPE CURRENT GENERATION CIRCUIT

CONCLUSION